What should I do if Alibaba Cloud reports a 500 error when building laravel?

Recently, when I was using Alibaba Cloud's virtual host to build a Laravel application, I encountered a difficult problem: 500 error.

First of all, I made sure there was no problem with my code because the local environment test passed. I also tried debugging on the server, but found no obvious errors.

So, I started to troubleshoot the problem step by step.

In the first step, I checked the Apache error log and found this error: ModSecurity: Access denied with code 403. This reminds me of Alibaba Cloud's Web Application Firewall (WAF).

In the second step, I logged into the Alibaba Cloud management console and found that WAF was indeed enabled. It may have interfered with my application.

In the third step, I disabled WAF, but the problem still exists.

The fourth step, I started to check the PHP error log and found this error: PHP Fatal error: Call to undefined function openssl_random_pseudo_bytes().

This error indicates that I need to install the OpenSSL extension. So, I installed OpenSSL using the following command:

sudo apt-get install openssl

Then, I restarted the Apache and PHP-FPM services:

sudo service apache2 restart
sudo service php7.1-fpm restart

Finally, I successfully solved the 500 error problem!

Summary

When using Alibaba Cloud's virtual host to build a Laravel application, you may encounter a 500 error. If there is no problem with your code itself, you can solve the problem by following these steps:

1. Check Apache's error log to see if there are any WAF-related errors.
2. Log in to the management console and disable WAF.
3. Check the PHP error log to find specific error information.
4. Install missing extensions and restart the service.

I hope this article will help you solve the Alibaba Cloud Laravel 500 error problem!

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